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List: insight-users
Subject: [ITK-users] itk::fem updating displacements
From: Yusuf OEZBEK via Insight-users <insight-users () itk ! org>
Date: 2017-11-09 19:59:10
Message-ID: 587898442.10039537.1510257550772 () mail ! yahoo ! com
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Dear ITK users,I have another question. In order to visualize the deformation, I want \
to replace the old node coordinates with the new one after generating the solution, \
like in UpdateDisplacements() function in itkFemSolver.hxx 610-651 The code-block, \
which generates solution:m_FemSolver->Update(); //m_FemSolver->UpdateDisplacements();
const unsigned int invalidId= itk::fem::Element::InvalidDegreeOfFreedomID;
int numberOfNodes= m_FemSolver->GetInput()->GetNumberOfNodes();
for(int i= 0; i< numberOfNodes; i++)
{
itk::fem::Element::Node::Pointer node= m_FemSolver->GetInput()->GetNode(i);
std::cout<<"FEM Mesh Node: "<< node->GetGlobalNumber() << " Coordinates: "<< \
node->GetCoordinates()<<std::endl;
for(unsigned int j= 0, dof; (dof= node->GetDegreeOfFreedom(j))!= invalidId; j++)
{
cout <<"FEM Mesh Solution: "<< m_FemSolver->GetSolution(dof)<<endl;
}
}
gives me following output, that shows, I have some solutions for nodes 69 and 70:FEM \
Mesh Node: 68 Coordinates: -61.1098 -139.262 211.9 FEM Mesh Node: 69 Coordinates: \
-61.0742 -139.319 211.9 FEM Mesh Solution: 82.6806
FEM Mesh Solution: -32.5517
FEM Mesh Solution: 6.36021
FEM Mesh Node: 70 Coordinates: -61.3429 -138.832 211.9
FEM Mesh Solution: 0.798099
FEM Mesh Solution: 37.6971
FEM Mesh Solution: -4.36149
FEM Mesh Node: 71 Coordinates: -61.5039 -138.402 211.509
FEM Mesh Node: 72 Coordinates: -61.6232 -138.402 211.9
if I want to update the displacements://itk::fem::LinearSystemWrapper::Pointer \
wrapper; VectorType replacedNodeVector(3);
for(int i= 0; i< numberOfNodes; i++)
{
TetrahedronNodeType::Pointer node= m_FemSolver->GetInput()->GetNode(i);
//itk::fem::Element::Node::Pointer node= m_Fem3dSolver->GetInput()->GetNode(i);
for(unsigned int j= 0; j< 3; j++)
{
std::cout<<"FEM Mesh Solution Vector: \
"<<m_FemSolver->GetSolution(node->GetDegreeOfFreedom(j))<<std::endl; \
replacedNodeVector[j] = node->GetCoordinates()[j] + \
m_FemSolver->GetSolution(node->GetDegreeOfFreedom(j)); //replacedNodeVector[j] = \
node->GetCoordinates()[j] + m_ls->GetSolutionValue(node->GetDegreeOfFreedom(j)); }
node->SetCoordinates(replacedNodeVector);
std::cout<<"FEM Mesh New Node: "<< node->GetGlobalNumber() << " Coordinates: "<< \
node->GetCoordinates()<<std::endl; }
I get as output:FEM Mesh New Node: 67 Coordinates: -61.0742 -139.262 211.797
FEM Mesh Solution Vector: 0
FEM Mesh Solution Vector: 0
FEM Mesh Solution Vector: 0
FEM Mesh New Node: 68 Coordinates: -61.1098 -139.262 211.9
FEM Mesh Solution Vector: 82.6806
FEM Mesh Solution Vector: -32.5517
FEM Mesh Solution Vector: 6.36021
FEM Mesh New Node: 69 Coordinates: 21.6064 -171.871 218.26
FEM Mesh Solution Vector: 0.798099
FEM Mesh Solution Vector: 37.6971
FEM Mesh Solution Vector: -4.36149
FEM Mesh New Node: 70 Coordinates: -60.5448 -101.135 207.539
FEM Mesh Solution Vector: 0
FEM Mesh Solution Vector: 0
FEM Mesh Solution Vector: 0
My questions are:
Do I do it correct for the replacements, if I sum the old node coordinate with the \
generated solution vector for that spacial node?:replacedNodeVector[j] = \
node->GetCoordinates()[j] + m_FemSolver->GetSolution(node->GetDegreeOfFreedom(j)); In \
my test application, I apply some force at node 1( loadNode->SetNode(1); ) but in \
generated solution it shows that the force doesn't act on node 1 and nodes around it \
but for nodes 68, 69, 82, and 83. All the other solutions are zero. My test mesh \
contains 86 nodes and 162 elements. If I want to apply the force except node 1,eg at \
node 20, I get then segmentation fault.typedef itk::fem::LoadNode LoadNodeType; \
LoadNodeType::Pointer loadNode= LoadNodeType::New(); \
loadNode->SetElement(tetrahedronElement.GetPointer()); loadNode->SetGlobalNumber(3);
loadNode->SetNode(1);
vnl_vector<double> force(3);
force[0]= 110.0;
force[1]= 20.0;
force[2]= 31.0;
loadNode->SetForce(force);
m_FemObject->AddNextLoad(loadNode);
For detailed information please see runnable test code:vtkUGridToFemMesh.zip
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vtkUGridToFemMesh.zip
Shared with Dropbox | |
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Thank you for any help!
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<html xmlns="http://www.w3.org/1999/xhtml" xmlns:v="urn:schemas-microsoft-com:vml" \
xmlns:o="urn:schemas-microsoft-com:office:office"><head><!--[if gte mso \
9]><xml><o:OfficeDocumentSettings><o:AllowPNG/><o:PixelsPerInch>96</o:PixelsPerInch></o:OfficeDocumentSettings></xml><![endif]--></head><body><div \
style="color:#000; background-color:#fff; font-family:Helvetica Neue, Helvetica, \
Arial, Lucida Grande, sans-serif;font-size:10px"><div \
id="yui_3_16_0_ym19_1_1510251141194_6598"><font size="2">Dear ITK users,</font></div> \
<div id="yui_3_16_0_ym19_1_1510251141194_6599"><font size="2">I have another \
question. In order to visualize the deformation, I want to replace the old node \
coordinates with the new one after generating the solution, like in \
UpdateDisplacements() function in itkFemSolver.hxx 610-651<br \
id="yui_3_16_0_ym19_1_1510251141194_6600"> The code-block, which generates \
solution:</font></div> <pre id="yui_3_16_0_ym19_1_1510251141194_6601"><font \
id="yui_3_16_0_ym19_1_1510251141194_6707" size="2"><code \
id="yui_3_16_0_ym19_1_1510251141194_6602">m_FemSolver->Update(); \
//m_FemSolver->UpdateDisplacements(); const unsigned int invalidId= \
itk::fem::Element::InvalidDegreeOfFreedomID; int numberOfNodes= \
m_FemSolver->GetInput()->GetNumberOfNodes();
for(int i= 0; i< numberOfNodes; i++)
{
itk::fem::Element::Node::Pointer node= m_FemSolver->GetInput()->GetNode(i);
std::cout<<"FEM Mesh Node: "<< node->GetGlobalNumber() << " \
Coordinates: "<< node->GetCoordinates()<<std::endl;
for(unsigned int j= 0, dof; (dof= node->GetDegreeOfFreedom(j))!= invalidId; j++)
{
cout <<"FEM Mesh Solution: "<< \
m_FemSolver->GetSolution(dof)<<endl; }
}
</code></font></pre>
<div id="yui_3_16_0_ym19_1_1510251141194_6603"><font \
id="yui_3_16_0_ym19_1_1510251141194_6665" size="2">gives me following output, that \
shows, I have some solutions for nodes 69 and 70:</font></div> <pre \
id="yui_3_16_0_ym19_1_1510251141194_6604"><font \
id="yui_3_16_0_ym19_1_1510251141194_6664" size="2"><code \
id="yui_3_16_0_ym19_1_1510251141194_6605">FEM Mesh Node: 68 Coordinates: -61.1098 \
-139.262 211.9 FEM Mesh Node: 69 Coordinates: -61.0742 -139.319 211.9
FEM Mesh Solution: 82.6806
FEM Mesh Solution: -32.5517
FEM Mesh Solution: 6.36021
FEM Mesh Node: 70 Coordinates: -61.3429 -138.832 211.9
FEM Mesh Solution: 0.798099
FEM Mesh Solution: 37.6971
FEM Mesh Solution: -4.36149
FEM Mesh Node: 71 Coordinates: -61.5039 -138.402 211.509
FEM Mesh Node: 72 Coordinates: -61.6232 -138.402 211.9
</code></font></pre>
<div id="yui_3_16_0_ym19_1_1510251141194_6606"><font size="2">if I want to update the \
displacements:</font></div> <pre id="yui_3_16_0_ym19_1_1510251141194_6607"><font \
id="yui_3_16_0_ym19_1_1510251141194_6644" size="2"><code \
id="yui_3_16_0_ym19_1_1510251141194_6608">//itk::fem::LinearSystemWrapper::Pointer \
wrapper; VectorType replacedNodeVector(3);
for(int i= 0; i< numberOfNodes; i++)
{
TetrahedronNodeType::Pointer node= m_FemSolver->GetInput()->GetNode(i);
//itk::fem::Element::Node::Pointer node= \
m_Fem3dSolver->GetInput()->GetNode(i);
for(unsigned int j= 0; j< 3; j++)
{
std::cout<<"FEM Mesh Solution Vector: \
"<<m_FemSolver->GetSolution(node->GetDegreeOfFreedom(j))<<std::endl;
replacedNodeVector[j] = node->GetCoordinates()[j] + \
m_FemSolver->GetSolution(node->GetDegreeOfFreedom(j)); //replacedNodeVector[j] \
= node->GetCoordinates()[j] + \
m_ls->GetSolutionValue(node->GetDegreeOfFreedom(j)); }
node->SetCoordinates(replacedNodeVector);
std::cout<<"FEM Mesh New Node: "<< node->GetGlobalNumber() << \
" Coordinates: "<< node->GetCoordinates()<<std::endl; }
</code></font></pre>
<div id="yui_3_16_0_ym19_1_1510251141194_6609"><font size="2">I get as \
output:</font></div> <pre id="yui_3_16_0_ym19_1_1510251141194_6610"><font \
id="yui_3_16_0_ym19_1_1510251141194_6643" size="2"><code \
id="yui_3_16_0_ym19_1_1510251141194_6611">FEM Mesh New Node: 67 Coordinates: -61.0742 \
-139.262 211.797 FEM Mesh Solution Vector: 0
FEM Mesh Solution Vector: 0
FEM Mesh Solution Vector: 0
FEM Mesh New Node: 68 Coordinates: -61.1098 -139.262 211.9
FEM Mesh Solution Vector: 82.6806
FEM Mesh Solution Vector: -32.5517
FEM Mesh Solution Vector: 6.36021
FEM Mesh New Node: 69 Coordinates: 21.6064 -171.871 218.26
FEM Mesh Solution Vector: 0.798099
FEM Mesh Solution Vector: 37.6971
FEM Mesh Solution Vector: -4.36149
FEM Mesh New Node: 70 Coordinates: -60.5448 -101.135 207.539
FEM Mesh Solution Vector: 0
FEM Mesh Solution Vector: 0
FEM Mesh Solution Vector: 0
</code></font></pre>
<div id="yui_3_16_0_ym19_1_1510251141194_6612"><font \
id="yui_3_16_0_ym19_1_1510251141194_6720" size="2">My questions are:<br \
id="yui_3_16_0_ym19_1_1510251141194_6613"> Do I do it correct for the replacements, \
if I sum the old node coordinate with the generated solution vector for that spacial \
node?:</font></div> <pre id="yui_3_16_0_ym19_1_1510251141194_6614"><font \
id="yui_3_16_0_ym19_1_1510251141194_6736" size="2"><code \
id="yui_3_16_0_ym19_1_1510251141194_6615">replacedNodeVector[j] = \
node->GetCoordinates()[j] + \
m_FemSolver->GetSolution(node->GetDegreeOfFreedom(j)); </code></font></pre>
<div id="yui_3_16_0_ym19_1_1510251141194_6616"><font \
id="yui_3_16_0_ym19_1_1510251141194_6662" size="2">In my test application, I apply \
some force at node 1( loadNode->SetNode(1); ) but in generated solution it shows \
that the force doesn't act on node 1 and nodes around it but for nodes 68, 69,
82, and 83. All the other solutions are zero. My test mesh contains 86
nodes and 162 elements. If I want to apply the force except node 1,eg at
node 20, I get then segmentation fault.</font></div>
<pre id="yui_3_16_0_ym19_1_1510251141194_6617"><font \
id="yui_3_16_0_ym19_1_1510251141194_6659" size="2"><code \
id="yui_3_16_0_ym19_1_1510251141194_6618">typedef itk::fem::LoadNode LoadNodeType; \
LoadNodeType::Pointer loadNode= LoadNodeType::New(); \
loadNode->SetElement(tetrahedronElement.GetPointer()); \
loadNode->SetGlobalNumber(3); loadNode->SetNode(1);
vnl_vector<double> force(3);
force[0]= 110.0;
force[1]= 20.0;
force[2]= 31.0;
loadNode->SetForce(force);
m_FemObject->AddNextLoad(loadNode);
</code></font></pre><div id="yui_3_16_0_ym19_1_1510251141194_6718">
<font size="2">For detailed information please see runnable test \
code:</font></div><div dir="ltr" id="yui_3_16_0_ym19_1_1510251141194_6719"><font \
id="yui_3_16_0_ym19_1_1510251141194_6755" size="2"><a \
id="yui_3_16_0_ym19_1_1510251141194_6754" \
class="enhancr2_c997ba3c-d147-b7a8-faff-66dfef0cd3dd" \
href="https://www.dropbox.com/s/n551i11lxv22m3b/vtkUGridToFemMesh.zip?dl=0">vtkUGridToFemMesh.zip</a></font></div><div><br></div><div \
id="enhancr2_c997ba3c-d147-b7a8-faff-66dfef0cd3dd" class="yahoo-link-enhancr-card \
ymail-preserve-class ymail-preserve-style" \
style="max-width:400px;font-family:'Helvetica Neue', Helvetica, Arial, sans-serif;" \
data-url="https://www.dropbox.com/s/n551i11lxv22m3b/vtkUGridToFemMesh.zip?dl=0" \
data-type="yenhancr" data-category="website" data-embed-url="" data-size="medium" \
dir="ltr" contenteditable="false"> <a id="yui_3_16_0_ym19_1_1510251141194_6782" \
href="https://www.dropbox.com/s/n551i11lxv22m3b/vtkUGridToFemMesh.zip?dl=0" \
style="text-decoration:none !important; color: #000 !important;" \
class="yahoo-enhancr-cardlink" target="_blank" rel="noreferrer"> <table \
id="yui_3_16_0_ym19_1_1510251141194_6781" class="card-wrapper yahoo-ignore-table" \
style="max-width:400px;" border="0" cellpadding="0" cellspacing="0"> <tbody \
id="yui_3_16_0_ym19_1_1510251141194_6780"><tr \
id="yui_3_16_0_ym19_1_1510251141194_6779"> <td \
id="yui_3_16_0_ym19_1_1510251141194_6778" width="400"> <table \
id="yui_3_16_0_ym19_1_1510251141194_6777" class="card yahoo-ignore-table" \
style="max-width:400px;" border="0" cellpadding="0" cellspacing="0" width="100%"> \
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style="background:#000 \
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<td id="yui_3_16_0_ym19_1_1510251141194_6826" \
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sans-serif;word-break:break-word;">vtkUGridToFemMesh.zip</h2> <div \
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